Why is the van heater not hot?

1 The reasons why the vehicle heating system is not hot can be divided into two aspects. One is caused by the engine cooling system, and the other is caused by the poor working of the heating control mechanism. When repairing, we must first determine Which aspect caused it, and then carry out corresponding repairs. The method of identification is very simple. Look at the temperature of the two water inlet pipes of the small heater water tank. If both pipes are hot enough, it means there is a problem with the air volume control mechanism. On the contrary, if both pipes are cold, or one pipe is hot and the other is hot. If it is cold, it means there is a problem with the cooling system. \r\n2 Possible problems in the cooling system are: \r\n1 The thermostat is always open or the thermostat is opened too early, causing the cooling system to undergo a large cycle prematurely, while the outside temperature is very low, especially when the car is running When you get up, the cold air quickly cools the antifreeze, the engine water temperature cannot come up, and the warm air will not heat up.\r\n2 The water pump impeller is damaged or lost, resulting in insufficient flow through the small warm air water tank, and the heat cannot come up. \r\nThird, there is air blockage in the engine cooling system. The air blockage causes poor circulation in the cooling system, causing high water temperature and low heating of the warm air. If there is always air in the cooling system, it is likely that the cylinder gasket is damaged and air is flowing into the cooling system; if the water inlet pipe of the small heater water tank is very hot and the water outlet pipe is cold, this situation should be that the small heater water tank is blocked. , the small heater water tank should be replaced. \r\nThe warm air is not hot:\r\nSolution: The warm air in the car uses a blower to blow the heat from the small warm air tank into the cab. If the air volume is not enough or the hot and cold air distribution is not good, the warm air will The heat from the small water tank cannot be dissipated, which will also cause the temperature of the warm air to not rise. At this time, first check whether the filter is dirty and clogged, clean it, and replace it in time if necessary; then check the operation of each gear of the blower, and each gear must reach sufficient speed. If the knob is adjusted to the warm air position, the air volume is large enough, the wind direction is normal, and cool air blows out, you should check whether the cables of the hot and cold air control flaps of the heater box have fallen off, whether the warm air impeller is damaged, whether the flaps have fallen off, etc. After troubleshooting, the heater will heat up.